Thread severing mechanism for looping machines



Mrh l', 1932. P. D. REDCAY THREAD SEVERING MECHANISM FOR LOOPINGMACHINES Filed Sept. 28, 1928 2 Sheets-Sheet March l, 1932.- P. 0.REDCAY THREAD SEVERING MECHANISM FOR LOOPING MACHINES Filed Sept. 28,1928 2 Sheets-Sheet 2 Patented Mar. 1, 1932 UNITED STATES PATENT OFFICEPAUL D. BEDCAY, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR; BY MESNE ASSIGNMENTS, T UNION SPECIAL MACHINE COMPANY, 'OF CHICAGO, ILLINOIS, A COR-J iIORATION OF ILLINOIS l THREAD SEVERING MECHANISM FOR LOOPING MACHINES 6Application filed September 28, 1928. Serial No. 309,024.

This invention relatesto a thread sever- 111g mechanism for use inconnection with a looping machine of the type employed for uniting partsof stockings or other knit work or fabric whereinthe parts'ofthe'stockings or other knit work are united by a continuous chain ofstitching which must be'severed at points between the stockings.

The object of the invention is to provide an improved severing devicefor such, alooping machine which willfautomatically sever the chain ofstitching that unites the several stockings or other knit fabric on themachine sothat the projecting threads at each side of the sewedstocking, whichis left, after the severing operation, will beof asubstantial uniform length.

A further object of the invention is to pro-, vide a severing mechanismin combination with an automatically operated feeding means for feedingthe loose chain of stitches.

between the stockings into the path of the severing mechanism. i I

Further objects of the invention will appear more fully hereinafter.

The invention consists substantially in the combination, construction,arrangement and relative location'of parts all as will be'morefully setforth as illustrated-in the accom+ panying drawings and finally pointedout in the appended claims.

Referring to the accompanying drawings in which the same or similarparts have been referred to in the. various views by the same referencenumerals,'

Figure 1 is a sideelevational view, partly in section, of sufiicientof'a looping machine, to illustrate my thread severing device ap pliedthereto. I

Fig. 2 is a plan view of the mechanism illustrated in'F-ig. 1.

Fig. 3 is a side elevationof the thread severing device taken on theline3-3 in Fig.

2, looking in the direction of the arrows.

Fig. A} is a side elevation of the thread severing device taken on thelined-4 in Fig.

2looking in the direction of the arrows.

f 12. 5 1s an end v ew of the threadsever- Flg. 61s a detail sideelevational view of the cutting blades of my thread severing de- I vice.

, Machines for uniting or sewing together the parts of knit goods suchas'stockings, of the type to which my thread severing device is applied,are well known in the artand it is'thought unnecessary to show herein ordescribe in detail the complete construction and operation thereof. Anillustration of a machine of this general type is shown and described inthe patent to Merrow, No. 330,606; dated November 17, 1885. It issufficient to say that generally machines of this type are providedwitha circular bed or support having a stitch forming mechanism po--sitioned with respect to said bed or supportso that its stitch formingelements operate over a' circular movable work supporting member whichisrotatably supported on the circular bed or support. The movableworksupporting member carries a series of radially projecting impalingpins which move with said support past the stitch forming mechanism.

In the operation of themachine the portions of the stockings or otherknit fabric to be united are placed on the impaling pins in such amanner that the edges of the same project'slightly above the impalingpins and the stitch forming: mechanism operates to place a line ofstitching in the projecting edges of the stockings or other knit fabricas the movable work supporting member causes the same to pass within thefield of action of the stitch forming mechanism. The articles to bestitched in this manner are usually placed upon the impaling pins aslight distance apart. The stitching mechanism is continuously operatedand therefore the threads carried by it will extend continuously fromone article to another just above the impaling pins; When i the stitchedarticles are removed from the impaling pins it is therefore necessary tosever these connecting threads between the articles. This isaccomplished either by hand onby mechanism provided for that purpose;

In the drawings illustratlng my improved cutting device, I have onlyshown sufficient of such a looping machine to illustrate theapmovablework supporting member is indica'te'd at 4. Theimpalingpinscarried bysaid movable work supporting member are shown at 5and project radially from said movable supporting member in theusual'well known manner. p

The thread severing mechanism of my mvention is mounted-at any suitablepoint on the circular bed or support lbeyond the stitch formingmechanism. The said mechanism may bebnerated from any suitable movingpant of the machine. One proposed means forbperating :the saineisillustrated in the drawings and will be described hereinafter.

The operating parts-of the severing mechanismare supported by abracket'member 6 which is secured to the circular bed or support ofzthemachine by-means'of the screw 'r'. Said bracket memherisprovidedwith'anoutwardly-extendingiarm 9 which may be formed integnalwith said bracket member or detachably secured thereto. by a screw 8 orothersuitable means.

The *freeend of said arm 9 carries a shortrotatable'shaft' :10. Fixedl-ysecured to said shaft is the :ratchet wheel 11 and-the circular 7 brush12.

:Pivotally secured to bracket member 6 as at 1-3 is a camshapedmemberlt'having a projection 15 The cam shaped member is also pivotallysecured as at 15a to a pawl anember 16. The free-end of said pawl memberis adapted 'to-en jage the teethof the ratchet wheel 11 and is held inengagement with the teethof said ratchet wheel by means of a spni-ngl"?which is-securedat oneend to said 4 pawl member and at the'otherend tothe-pin 1'8-mounted in said supporting bracket 6.

. Mounted onsaid bracket member-6 is a stationary cutting'member 19which is integrally secured to said bracket and is positioned so thatits cutting edge extends adjacent to the impa-l-ing pins-5 on :themovable work support member 4 and behind the edges of the articleimposed on the impaling pins.

'Thepin 1'8 mounted in supporting bracket 6 pa'sses throughthe-stationary cutting member 19 and supports the movable cuttingmember21. Themovable cutting member is posiwith a rearwardly extendingarm tioned with respect to the fixed cutting mem-- ber 19 so thatits'cutting edge has a shearing action with the cutting edge o'fsaidmember 19 and is held in such shearing position by nut 20. a

The movable cutting member is provided which is I to said cam shapedmember andsaiclmovable arm. Also secured between the arm 22 andthe-circular base plate is thespring 26 which is adapted tonormally holdsaid arm so that the cutting edge of the movable cutting blade is closedwith respect to-the cutting edge of the stationary cutting member.

The operation of the cutting mechanism described above is as follows:After astoc'king or other article-imposed upon the impa'ling'pins hasbeen stitched by the stitching mechanism thus forming a slightlyprojecting stitched portion or welt it passes to the cutting mechanism.The eccentric 23 which is continuously rotated on shaft 24L actuates thearm 22 of the movable cutting member causing said cutting member to rockon the pin 18 soas to have a shearing action with the fixed cuttingmember 19. The -movement of the arm .22' of the movable cutting-memberfa'lso-causes the cam shaped member 14 to actuate the pawl '16 sothat it rotates the ratchet wheel 11-and consequently rotates thecircular brush 12. The brush is so'positioned with respect to theimpaling pins 5 sameinwardly and towardsthe cutting edges of thecuttingmembers 19 and21.

As eaohsone of the stitched articles passes by the cutting mechanism thebrush sweeps the connecting thread 29 between such stitchedarticle andthe next stitched article, inwardly, into the field of action of thecut- 31?}OI1C8 severed. In view of the relative po- 7 sitions of theseveral parts .it-can be seen that the thread is severed atsubstantially equal distances from the-knitted articles.

In order to insure thethread-extending between the stitched articlesbeing swept into the path of the cutting members a guard 28 maybesecured to the plate 27 which may be mounted on the pin 18 of thesupporting bracket and held in place by said nut 20 anda guard31 may bemounted onan extension 32 secured to said supporting bracket so that thebrush will sweep the thread between said guard and the impaling pinsinto the path of the cutting members.

It will be seen that by the action of the several parts of the abovedescribed severing mechanism that the stitching thread which extendsbetween the stitched articles will be severed positively andautomatically and the projecting threadsiat each side of the that inrotating it brushes across the sewed article after the severingoperation will be of a substantially uniform length.

Having now fully described my invention, what I claim as new and desireto secure by Letters Patent is 1. A sewing machine including incombination work suspending and feeding means, a thread cuttingmechanism comprising a stationary cutting blade, a movable cutting bladeand devices for operating the same, all disposed at one side of theplane of travel of the fabric sections, a brush located above saidfabric sections and rotating about a horizontal axis, and meansforintermittently rotating said brush in timing with the operation ofthe movable cutting blade for placing enchained thread loops between thecutting blades while said blades are separated.

2. A sewing machine including in combination work suspending and feedingmeans, a thread cutting mechanism comprising a stationary cutting bladeand a movable cutting blade, a spring for moving said blade for severingthe enchained threads placed between the cutting blades, a rotatingdevice for separating the cutting blades, a brush rotating about ahorizontal axis and located above the travel of the fabric sections, andmeans for intermittently rotating the brush operated by the movablecutting blade and timed so as to place the enchained thread loopsbetween the cutting blades while they are separated.

In testimony whereof I have hereunto set my hand on this 24th day ofSeptember A. D.,

PAUL D. REDCAY.

